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New Accounting Standards Not Yet in Effect - Summary of Accounting Standards (Detail)
12 Months Ended
Dec. 31, 2020
IFRS 17– Insurance Contracts 1  
Description Of Expected Impact Of Initial Application Of New Standards Or Interpretations [Line Items]  
Effective as of Jan. 01, 2021
Amendments to IFRS 10 and IAS 28 [Member]  
Description Of Expected Impact Of Initial Application Of New Standards Or Interpretations [Line Items]  
Effective as of Jan. 01, 2020
Amendments IFRS 3 [Member]  
Description Of Expected Impact Of Initial Application Of New Standards Or Interpretations [Line Items]  
Effective as of Jan. 01, 2022
Amendments IAS 1 [Member]  
Description Of Expected Impact Of Initial Application Of New Standards Or Interpretations [Line Items]  
Effective as of Jan. 01, 2020
Amendments IAS 16 [Member]  
Description Of Expected Impact Of Initial Application Of New Standards Or Interpretations [Line Items]  
Effective as of Jan. 01, 2021
Amendments IAS 37 [Member]  
Description Of Expected Impact Of Initial Application Of New Standards Or Interpretations [Line Items]  
Effective as of Jan. 01, 2021
Annual Improvements to IFRS Standards 2018–2020 [Member]  
Description Of Expected Impact Of Initial Application Of New Standards Or Interpretations [Line Items]  
Effective as of Jan. 01, 2020